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by fixitsan
Wed Jan 01, 2014 10:48 pm
Forum: Other projects
Topic: LED light controller
Replies: 2
Views: 4351

Re: LED light controller

The straightest hack would be to modify the remote control by carefully removing the keypad and identifying the track matrix which exists behind it. Imagine the keypad as a simple 6 x 4 matrix and the controller chip alternately applies 5v to each of the 6 rows in turn, and when you press a button y...
by fixitsan
Mon Dec 30, 2013 8:21 am
Forum: Advanced users
Topic: Using Arduno with the Pi as a Analoginput datalogger withcsv
Replies: 5
Views: 3210

Re: Using Arduno with the Pi as a Analoginput datalogger wit

Because Excel accepts CSV then it should be easy. Often, data which is collected needs to be scaled or manipulated before it is written to an output file. There are at least two ways to do this - either capture all data in one go into a large buffer (Python is good for this), and then manipulate the...
by fixitsan
Mon Dec 02, 2013 9:03 am
Forum: Advanced users
Topic: Have Raspberry Pi to read RSS feed
Replies: 3
Views: 2126

Re: Have Raspberry Pi to read RSS feed

I'm working on a similar project, I have a working rss reader based on feedparser, with a web based front end to allow you to add/remove feeds easily (Or alternatively you can just add a file containing the feeds which you want to use).drop me a line if you wish Chris PS I currently have it set to r...
by fixitsan
Wed Nov 20, 2013 12:24 pm
Forum: Other projects
Topic: Race vehicle data logger.
Replies: 48
Views: 45142

Re: Race vehicle data logger.

...cont I'm actually new to the Pi too. I'm using Python to make an internet RSS feed reader, parse the information and send the output to the serial port so that we can have a scrolling news display in the lounge (wife is an ex journalist) The control panel for it is an inbuilt web interface runnin...
by fixitsan
Wed Nov 20, 2013 11:14 am
Forum: Other projects
Topic: Race vehicle data logger.
Replies: 48
Views: 45142

Re: Race vehicle data logger.

No problem Greg, the key thing (for an easy time with this) is to use the ELM327. It has an AT command set (remember that from the dialup days ? ) You would need to only start the bluetooth connection, then send it a couple of AT commands which tell it which OBD protocol to use, EG 'ATP5' for protoc...
by fixitsan
Tue Nov 19, 2013 9:40 pm
Forum: Beginners
Topic: Time-lapse photography 24 hours???
Replies: 9
Views: 2120

Re: Time-lapse photography 24 hours???

by fixitsan
Tue Nov 19, 2013 9:23 pm
Forum: Beginners
Topic: Time-lapse photography 24 hours???
Replies: 9
Views: 2120

Re: Time-lapse photography 24 hours???

Yes, regearding the switching of peripherals, i am talking specifically about the off-board hardware peripherals, the camera and the pyro sensor in particular. You could try connecting the +ve pin of the pyro sensor to 'Pi +ve 'via the C-E pins of an PNP tranistor. The base of that transistor could ...
by fixitsan
Tue Nov 19, 2013 1:18 pm
Forum: Beginners
Topic: Time-lapse photography 24 hours???
Replies: 9
Views: 2120

Re: Time-lapse photography 24 hours???

Looks reasonable enough with a caveat or two Apart from ignoring the use of SI units ;) I think you should see over 15 hours of runtime. But bear in mind that battery packs with a rating of 15600mAh (mill amp hour) will not produce that much energy at the output once it is stepped up to 5V, due to c...
by fixitsan
Sun Nov 17, 2013 12:49 pm
Forum: Other projects
Topic: Race vehicle data logger.
Replies: 48
Views: 45142

Re: Race vehicle data logger.

I think that's a good idea Greg. If you use an Android app which looks to 'speak' ELM327, then generating ELM327 at the Pi is totally feasible. I've completed a couple of projects using the ELM327 and found the command structure to be very easy to work with. The datasheets contain all the important ...
by fixitsan
Fri Nov 15, 2013 9:59 am
Forum: Advanced users
Topic: raspberry pi ECM for cars?
Replies: 14
Views: 12235

Re: raspberry pi ECM for cars?

Have you looked at any of the 'Megasquirt' systems ?

They allow you to customise the kit for any engine, and it has a lot of support

Try http://www.megamanual.com/index.html
by fixitsan
Fri Nov 15, 2013 9:54 am
Forum: Beginners
Topic: Is the Raspberry for me
Replies: 4
Views: 1088

Re: Is the Raspberry for me

Hi Chad. Many ways to cook an egg. The Arduino and the Raspberry, or a PIC, could all do this. When I'm designing I start by writing out my requirements in real world numbers. Specifically, number of inputs required, number of outputs required, minimum response time, interfacing to relays/solenoids ...
by fixitsan
Thu Nov 07, 2013 6:29 pm
Forum: Other projects
Topic: 64x32 LED display
Replies: 21
Views: 9208

Re: 64x32 LED display

I'm curious to know how well the scrolling text works on that large display. After speaking with the designer at Embedded Adventures it seems like they are willing to respond to requests to make the scrolling speed adjustable. I asked them if they could make it a user selectable parameter for my RSS...
by fixitsan
Thu Nov 07, 2013 9:30 am
Forum: Other projects
Topic: 64x32 LED display
Replies: 21
Views: 9208

Re: 64x32 LED display

I found some of the code I used, I already posted it on one of my groups.... At the top of the code.... import serial ser = serial.Serial() ser.port = "/dev/ttyAMA0" ser.baudrate = 9600 ser.bytesize = serial.EIGHTBITS #number of bits per bytes ser.parity = serial.PARITY_NONE #set parity check: no pa...
by fixitsan
Thu Nov 07, 2013 8:27 am
Forum: Other projects
Topic: 64x32 LED display
Replies: 21
Views: 9208

Re: 64x32 LED display

If yiou haven't already done so you need to reassign the serial port to make it user accessible. As standard the UART is assigned as the Pi's console. I searched these forums for clues like 'using serial port on Pi', and soon found the correct config files to play with, but it basically involved del...
by fixitsan
Wed Nov 06, 2013 9:38 pm
Forum: Beginners
Topic: Running RPi for 20 mins on battery
Replies: 4
Views: 1482

Re: Running RPi for 20 mins on battery

Lightest is going to be lithium polymer. If your Pi isn't driving anything too power hungry allow for 600mA average current. (you had better measure the current being drawn first) To power the Pi for 1 hour will therefore require 600mAH of capacity. For 12 minutes yoiu need 600/5= 120mAh capacity an...
by fixitsan
Wed Nov 06, 2013 9:21 pm
Forum: Other projects
Topic: 64x32 LED display
Replies: 21
Views: 9208

Re: 64x32 LED display

I've got one of Embedded Adventures 80 x 8 led boards here. I cheated with the driving by getting their adaptive driver module for another few pounds, which does all the scanning/muxing and that means you only need to send it serial data straight from the Pi's UART. Well worth the extra investment, ...
by fixitsan
Mon Oct 28, 2013 10:05 pm
Forum: Other projects
Topic: RPi in a Civic Si?
Replies: 4
Views: 1214

Re: RPi in a Civic Si?

You can get a bluetooth enabled ELM327 interface for £7 and commmunicate with it directly as you drive to get vitals. It's very simple, all commands are 'AT' commands. Just google for the 'ELM327 datasheet' from Elm Electronics and you'll get the idea very quickly. I modify these units to make a spe...
by fixitsan
Sat Oct 26, 2013 10:28 am
Forum: Beginners
Topic: Single Webpage
Replies: 5
Views: 991

Re: Single Webpage

Python has a built-in HTTP server class, SImpleHTTPServer (in 2.7) that might be the easiest way to do what you want. See http://docs.python.org/2/library/simplehttpserver.html and Google for some code examples. I've been looking to do an identical task as the OP. The Pi will function as an RSS rea...
by fixitsan
Fri Oct 25, 2013 8:48 pm
Forum: Other projects
Topic: 12v Li-ion charging circuit?
Replies: 14
Views: 6886

Re: 12v Li-ion charging circuit?

No problem E, just bear in mind that the circuit demands that the wall wart must be powerful enough to charge the batteries while powering the amp, so you might need 3A..... Best thing to do is to measure the current properly, to the charger when the batteries are flat and to the amp/pi setup when i...
by fixitsan
Fri Oct 25, 2013 11:04 am
Forum: Other projects
Topic: 12v Li-ion charging circuit?
Replies: 14
Views: 6886

Re: 12v Li-ion charging circuit?

You could easily add a 12V relay in cicruit so that the output side of the battery is disconnected whenever the main 12V charge voltage is present. Probably easier to use power diodes for switching. Usually the voltage that is used for charging the battery needs to be higher than the voltage on the...
by fixitsan
Fri Oct 25, 2013 8:13 am
Forum: Other projects
Topic: 12v Li-ion charging circuit?
Replies: 14
Views: 6886

Re: 12v Li-ion charging circuit?

Just taking it to it's logical conclusion...after looking at the battery once again it looks like it uses 12V input, which means that mains 'wall wart' adapter outputs 12V. If the adapter had a larger current capacity it could easily power the amp, Pi and charge the battery. I might be tempted to re...
by fixitsan
Thu Oct 24, 2013 8:29 pm
Forum: Other projects
Topic: 12v Li-ion charging circuit?
Replies: 14
Views: 6886

Re: 12v Li-ion charging circuit?

I didn't notice the dc-dc convertor you were waiting for...it looks ideal, 3A maximum is plenty. You look like yoiu have a maximum of about 1.5A at 5V. Say 0.75A input to the regulator at 12V And an estimated 1.25A for the amp is 2A total at 12V For the battery pack you linked to (6800mAh), that 2A ...
by fixitsan
Wed Oct 23, 2013 6:48 pm
Forum: Python
Topic: lcd custom characters
Replies: 7
Views: 1951

Re: lcd custom characters

I made this a while ago (the fish character is made of custom chars) http://www.youtube.com/watch?v=zvhqimcQFVE I can't tell you the exact 'trick' to doing it, but I can tell you the answer is in the datasheet for the lcd display usually. The standard 16 x 2 lcd datasheet describes it on page 15 onw...
by fixitsan
Wed Oct 23, 2013 6:34 pm
Forum: Python
Topic: Barcode Database???
Replies: 6
Views: 3879

Re: Barcode Database???

You found nothing ? How come ?

Typed into Google 'barcode standards' and got a flood of hits, including the Wiki http://en.wikipedia.org/wiki/Barcode (look towards the bottom of the Wiki)

Also GS1's site has a form of database http://www.gs1.org/barcodes/technical/bar_code_types
by fixitsan
Wed Oct 23, 2013 6:20 pm
Forum: Beginners
Topic: creating mobile cell network using raspberry pi and huawei 3
Replies: 12
Views: 13487

Re: creating mobile cell network using raspberry pi and huaw

I think you are talking about this: with pay as you go SIMcard from three.co.uk to make calls for 3p/min and send SMS for 2p Not sure if they still do it, but I used to run as pay as you go SIM on Three too. If you registered the number online at MyThree you could then purchase 'add ons', one of wh...

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